Envelop and process of making and sealing the same.



J. KOPEC.

ENVELOP AND PROCESS OF MAKING AND SEALING THE SAME.

APPLICATION FILED MAR. ISL 1918.

1,294, 18 1 Patented Feb. 18, 1919.

2 SHEETS-SHEET I.

m: NORRIS rnsns ca. Pnamunm, msmrvcrou. n. c.

J. KOPEC.

ENVE'.0P AND PROCESS OF MAKING AND SEALING THE SAME.

APPLICATION FILED MAR. 18, 1918.

Patented Feb. 18, 1919.

2 SHEETS-SHEET 2.

flue wioz JULIUS KOPEC, OF FRANKFORT HEIGHTS, ILLINOIS.

ENVELOP AND PROCESS OF MAKING AND SEALING- THE SAME.

To all whom it may concern:

Be it known that I, JULIUS Korno, a citizen of the United'States, residing at Frankfort Heights, in the county of Franklin and State of Illinois, have invented certain new and'useful Improvements in Envelops and Processes of Making and Sealing the Same; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the artto which it appertains to make and use the same.

This invention relates to envelops, and it more specifically relates to what may be termed a multi-seal message packet.

One of the objects of this invention is to provide an envelop that cannot be opened without detection.

Another object is toprovide an envelop that protects the letter or other inclosure against unauthorized observation through the envelop;

Another object is to provide a device of this character that protects the inclosures against damage by external and contiguous mail matter, by the several thicknesses of paper that constitute its inner and outer and intermediate walls.

Another object is to provide an envelop of this character that is light in weight so as not to increase the postage beyond that which applies to ordinary envelops.

Another object is to provide a message packet in which envelop and letter sheet are folded together in a manner to prevent unauthorized inspection without irreparable mutilation of the envelop and letter sheet.

Other objects and advantages may become apparent to persons who read the following details of description in connection with the accompanying drawings in which Figure 1 is a plan view of the paper blank from which my improved envelop is formed;

Figs. 2, 3, 4, 5 and 6 are perspective views of the blank in the successive stages of the folding or forming operation;

Figs. 7, 8, and 9 are perspective views of the finished envelop in the several stages of the closing. and sealing operation;

Fig. 10 is a perspective view of the finished envelop open to receive the letter;

Fig. 11 is a perspective view of the envelop ready for mailing; and

Fig. 12 is a sheet of writing paper especially designed or creased for folding to fit Specification of Letters Patent.

1 Patented Feb. 18, 1919.

Application filed March 18, 1918. Serial No. 223,166.

within this form of envelop, and which may be combined with this envelop to constitute an improved means for the safe and secret transmission of messages.

Referring to these drawings in detail, in which similar reference characters correspond with similar parts throughout the several views, it will be seen that the blank (as shown in Fig. 1) is divided into squares and half-squares or triangles. There are three squares 1, 2 and 3, respectively arranged corner to corner in the median line of the blank. These squares each remain unfolded at all times and are hereinafter referred to as the non-folding squares or quadrangles. There are four squares 4, 5, 6 and 7 respectively, whose inner boundary lines coincide respectively with the boundary lines of the middle square 2. There are four triangles, 8, 9, 10 and 11, respectively,and the bases of these triangles combine to form parallel outer edges of the blank. The broken lines across the blank define the internal boundaries of said squares and triangles, and along these broken lines the blank is folded in forming and sealing the envelop.

This envelop may be described with greater clearness by first defining the successive steps or stages in the process of making it, which is as follows The blank is first folded along the line (1-1) (see Figs. 2 and 3) so that the squares 1 and 2 are now in superposed relation to one another and the squares 4 and 5 are folded on themselves so that the triangular halves of each of these squares are in superposed relation to one another, as shown in Figs. 3 and 4. The blank is next folded along the lines 0-6 and d.e, as shown in Figs. 1 and 5, so that the previously folded squares 4 and 5 are now in superposed relation to the previously superposedsquares 1 and 2. The blank is next folded along the lines Z-m and Z4n so as to bring the triangular flap 8 into superposed relation to the superposed elements 1, 2 and 4, and to bring the flap 9 into superposed relation to the elements 1, 2 and 5. The flaps 8 and 9 are of a size and shape to interlap with one another, as shown at 12 in Figs. 6 and 7, and these flaps are each provided with an adhesive coating 13 whereby they unite the meeting edges of the elements 4 and 5 (Fig. 5) and also unite with one another at their. interlapped edges. When these elements ice tutes the auxiliary or outer closure flap.)

Fig. 10 shows an opening extending from 0 to (Z and constituting the entrance to a tr1-.

angular pocket 16 that receives the lettersheet, or any similar inclosure, and the. latter may be either square or triangular, the latter being preferable for the sake of perfect security against unauthorized inspection, as will appear hereinafter. Referring to Fig. 12, it will be seen that when this sheet of paper is folded along the broken line that extends from corner to corner, it is made triangular, so that its rectangle may fitthe lower part of the envelop, while its acute angles are disposed at the respective points 0 and (Z, and the main flap may now be turned into closing position by folding the envelop along the lines c-al to bring the points 0 and f into registry and contact, as showniin Figs. 7 and 8, and the envelop is now singly-sealediand is as safe as any ordinary envelop; but, in order to render the envelop super-safe, it is again folded and again sealed. This isefiected by folding the letter-sheet and the envelop together, {the latter being folded along the fold lines or creases g-eh; and i which now coincide respectively with the fold lines 7cm and Z-m (see Figs. 7 and 8). In thusre-sealing or double-sealing the envelop, the adhesive coated endsof the flaps '6 and 7 are inserted in the pocket which has been formed betweenthe elements 1 and 2, as shown in Fig. 9, andthe auxiliary sealing flap part of the element 1' is then secured to these elements 6 and 7 by means of the adhesive coatings 15 and 17 (see Figs. 8 and 9).

The process in brief, consists in securing a message against undetectable inspection by (1st) providing a letter-sheet bearing the message, (2nd) providing a foldalole envelop with a pocket and with a pocket-closingfiap and with a sealing flap, (3rd) placing the letter-sheet in said pocket, (eith) closin said pocket withsaid pocket-closing flap, 5th) folding said pocket and the inclosed letter-sheet, and (6th) sealing theenvelop A. and letter-sheet in their folded relatiOn by means of said flap.

It will be seen, therefore, that the; envelop is not only double-sealed, but that the lettersheet is folded with the envelop prior to the final sea-ling step, and that the letter-sheet can not be removed from the envelop after merely slitting the latter along any one or more of its edges; but, in order to gain access to the letter-sheet so as to read its contents, the envelop and letter-sheet must first also be 'appreciatedbybe unfolded, and this can only be done by mutilating the flap or element 1. After unfolding the envelop and letter-sheet, the unfolded envelop shown in Fig. 8 may then be slit along either edge so as to gain access to the letter-sheet; but by merely disengaging the adhesive 1 L along one edge, the letter sheet can not be removed from and replaced in the env 610]), so as to avoid detection of the fact that the letter or message has been tam pered with.

In order that this envelop may be as light as possible, consistent withstrength, and in order that it may not be opened-without mutilation, I prefer to make :it of ve y'thifi paper su h s issue or :sen1 issue paper As the fo ded and se ed envelop-prote the inclosure by "at least {three thicknesses or walls of the envelop, the -:message.is more fully protected from inspectionZthan Y if shielded by only one thickness of thicker paper.

From the foregoing it vwi ll be seen: that this form of envelopand message packet is of exceptional importance in ti'mfiof war for transmitting messages from oneflficfir to a other, for it insures that he me sage-ha not been also transmitted-totheenemy by an unfaithful messenger, This envelop will all pe son -wh wish the r m ssag p es ved :i-niper e t secrecy- It is to be understood that my invention is not limited to the exactdetails as herein described, but that minor ;changes, nay ,be made within the 1 scope bf the appended claims. j

lVhat I claim as my invention is-':v

1. An envelop formed with a -pnclreth-having corners, a sealing fiap novabl e into" superposed relation with one side ofthe pocket and provided with means o-fornsecuringgit in said atio a ling fl p th t rrent side of said pocket, said; pocket, having foldlines along which the pocket and thefirst Said n y b eld d, S lfQlQJ HBSB ing arranged so as to allow two: eornersof said pockettobe inserted between the body o the op a th swans a d. flan; a meansfor securingathe second said flap to said corners 2. An envelop formedwith a triangular pocket, asealing flap movable intotsuperposed relation with one side offlthe popket and provided with means f rts'ecuring it in a 1elation; seelin fla an aras side of said pocket, said poeket having fold- :lines alongwhich the pocket and the first said flap may be folded, fold linesbeing arranged so as to allow two cornersof said triangular pocket to be inserted vbetween the body of the envelop andithe second saidfiap; and means for SC11TlI1gH3l1e second said flap to saidcorners. v

3. lircombination a lettersheeha pocket containing said letterrSl ett and havingends folded with said letter-sheet against the inmy hand in the presence of two subscribing termediate part of the pocket, a flap closing witnesses.

said pocket and folded therewith and with said letter-sheet, a second flap overlapping 5 the folded ends of the pocket, and means for securing said second flap to said folded ends.

In testimony whereof I have hereunto set JULIUS KOPEC.

Witnesses:

L. L. DARNEL, LEO ARMSTRONG.

Copies of this patent may be obtained for five cents each, by addressing the "Commissioner of Patents, Washington, D. O. 

